Flower Tartlets Questions

How do I keep the shortcrust from shrinking or slumping in the molds?

Keep the butter cold and knead the dough only briefly - overworking develops gluten, which makes the pastry pull back as it bakes. The chilling step after wrapping the dough in cling film matters most, so don't skip it and chill the lined molds again if the dough softened while you cut and fitted the side strips. Press the strips snugly against the base seam so the sides can't slide down.

Can I swap the plum jam or use a different flour or sugar?

Any jam works here - the recipe explicitly leaves it open, so apricot, raspberry or red currant all fit, and a tarter jam balances the sweet pastry cream nicely. For the pastry cream you can replace the 20 g cornstarch with the same amount of custard powder, and the 250 ml milk can be whole or low-fat, though whole milk sets richer. Stick with all-purpose flour for the crust; swapping in whole grain flours changes how much water the dough needs.

How far ahead can I prepare the components?

The dough and the pastry cream are both make-ahead friendly: wrap the dough and refrigerate it, and cover the finished cream directly on its surface with cling film so no skin forms. Baked, cooled tart shells keep well at room temperature in an airtight tin. Assemble only shortly before serving, because the jam and cream soften the crust over time - and dust with powdered sugar at the very last moment, as the recipe notes.

How should I store the finished tartlets and how long do they keep?

Once filled with pastry cream and fresh berries they belong in the fridge, loosely covered so the blueberries and raspberries don't get crushed. Eat them within a day or two - the egg-yolk cream is perishable and the shortcrust keeps drawing moisture from the jam and fruit. They aren't suited to freezing after assembly, but unfilled baked shells freeze fine.

What are the most common mistakes with the pastry cream?

The two classics are scrambled yolks and a runny cream. Pour the hot milk into the yolk-sugar-cornstarch mixture slowly while whisking, exactly as the recipe says, so the yolks temper instead of setting; then bring it back to the pot and let it actually bubble and thicken, since cornstarch only reaches full thickening power at the boil. Whisk constantly at that stage to avoid scorching on the bottom, and let the cream cool completely before you spoon it over the jam - warm cream will soak straight into the base.